The Study Of Gold Nanoparticles Regulating The Fluorescence Of Quantum Dots

Quantum dot is a kind of semiconductor nanomaterials,its have broad excitation spectrum and narrow emission spectrum,light stability and good biological compatibility has been used in biomarkers,biological imaging,and many other fields of research.The Au nanoparticles is good for biocompatibity.And the chemical properties stability,non-toxic,and the properties of surface plasmon are good surface enhancers.Fluorescence resonance energy transfer technology to reduce the fluorescence of Au nanoparticles has great application potential,At the same time,the local electromagnetic field enhancement phenomenon generated by gold nanoparticles plays an active role in the quantum fluorescence enhancement.Based on the unique properties of quantum dot and gold nanoparticles,the theoretical model of interaction between three quantum dots and gold nanoparticles is studied.In addition,the research on the reduction and enhancement of quantum dot fluorescence was carried out.Gold nanoparticles control the decrease of quantum dot fluorescence.A composite system for reducing the fluorescence of quantum dots was established by means of electrostatic bonding.The spectra were stimulated and measured by scanning electron microscope.The influence of distance on system fluorescence was analyzed.The results show that the distance is inversely proportional to the fluorescence intensity of the system,and it conforms to the theory of foster fluorescence resonance energy transfer.In controlling the fluorescence enhancement A composite film with enhanced quantum dot fluorescence was established by using the self-binding method.The effect of the deposition distribution of gold nanoparticles on the fluorescence of quantum dots was studied.The results showed that the fluorescence enhancement of the quantum dots was increased by 2.5 times.